58406126 ÷ 686 
The aim is to understand the frequency of 686 in 58406126.

Let's proceed to step 1:
686 goes into 5 0 times with a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Append the next digit (8) from the dividend to 5 and continue with: 58 / 686

On to step 2:
686 can be fit into 58 0 times, resulting in a remainder of 58.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 58 leaves us with 58.
Grab the next digit (4) from the dividend, add it to 58, then carry on: 584 / 686

On to step 3:
The number 686 fits into 584 0 times, leaving a remainder of 584.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 584, we get 584.
Include the next digit (0) from the dividend after 584, then repeat: 5840 / 686

Advancing to step 4:
If we divide 5840 by 686, we get 8 and a remainder of 352.
Use 8 as the next digit of our solution. 
Result so far: 8.0
If we subtract 5488 from 5840, we get 352.
Include the next digit (6) from the dividend after 352, then repeat: 3526 / 686

Moving on to step 5:
When dividing 3526 by 686, we get 5 with a remainder of 96.
Use 5 as the next digit of our solution. 
Result so far: 85.0
Subtract 3430 from 3526 to get 96.
Fetch the next digit (1) from the dividend, attach it to 96 and continue: 961 / 686

Step 6:
The number 686 fits into 961 1 times, leaving a remainder of 275.
Write down 1 as next digit of the result. 
Result so far: 851.0
The remainder is 275 after subtracting 686 from 961.
Fetch the next digit (2) from the dividend, attach it to 275 and continue: 2752 / 686

Advancing to step 7:
686 can be fit into 2752 4 times, resulting in a remainder of 8.
Use 4 as the next digit of our solution. 
Result so far: 8514.0
Deduct 2744 from 2752 and we're left with 8.
Append the next digit (6) from the dividend to 8 and continue with: 86 / 686

Step 8:
The number 686 fits into 86 0 times, leaving a remainder of 86.
Record the quotient 0 as the next digit in the result. 
Result so far: 85140.0
If we subtract 0 from 86, we get 86.
Since there are no more digits in the dividend, we add a zero to the remainder making it 860, and continue the process.

Advancing to step 9:
When dividing 860 by 686, we get 1 with a remainder of 174.
The number 1 becomes the next digit in our result. 
Result so far: 85140.1
If we take 686 away from 860, we end up with 174.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1740, and continue the process.

On to step 10:
686 goes into 1740 2 times with a remainder of 368.
Write down 2 as next digit of the result. 
Result so far: 85140.12
Deduct 1372 from 1740 and we're left with 368.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3680, and continue the process.

Going ahead to step 11:
When dividing 3680 by 686, we get 5 with a remainder of 250.
Record the quotient 5 as the next digit in the result. 
Result so far: 85140.125
If we subtract 3430 from 3680, we get 250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2500, and continue the process.

Advancing to step 12:
686 can be fit into 2500 3 times, resulting in a remainder of 442.
The number 3 becomes the next digit in our result. 
Result so far: 85140.1253
Subtracting 2058 from 2500 leaves us with 442.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4420, and continue the process.

Step 13:
If we divide 4420 by 686, we get 6 and a remainder of 304.
Use 6 as the next digit of our solution. 
Result so far: 85140.12536
The remainder is 304 after subtracting 4116 from 4420.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3040, and continue the process.

Advancing to step 14:
The number 686 fits into 3040 4 times, leaving a remainder of 296.
The number 4 becomes the next digit in our result. 
Result so far: 85140.125364
Deduct 2744 from 3040 and we're left with 296.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2960, and continue the process.

On to step 15:
If we divide 2960 by 686, we get 4 and a remainder of 216.
The next digit of our result is 4. 
Result so far: 85140.1253644
Subtracting 2744 from 2960 leaves us with 216.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2160, and continue the process.

The final outcome is 85140.1253644, with a leftover of 2.16e-06.